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Cash Flow Information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of cash flow statement [Abstract] |  |  |
Accounts receivable | $ (79) | $ 261 | $ 58
Prepaid expenses | 2 | 0 | 19
Income taxes receivable | (4) | (6) | 0
Inventory | 6 | (13) | (21)
Accounts payable, accrued liabilities and provisions | 160 | (130) | (97)
Income taxes payable | 4 | 9 | (3)
Change in non-cash operating working capital | $ 89 | $ 121 | $ (44)

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